Abstract: The proposed apparatus comprises a chamber containing an abrasive powder, two pairs of powder compacting mechanisms arranged one above the other, means for charging the abrasive powder to the chamber, and gates for discharging the used powder. In addition, the apparatus further includes a system of conduits for separately feeding the abrasive powder to the space between working members of the powder compacting mechanisms and the plane along which the strip is pulled, and a system of conduits for separately evacuating the powder from said working space to gates for discharging the powder from the chamber.

Abstract: The proposed chamber relates to sheet rolling in metallurgy. The chamber has two halves with a structure for closing, sealing, and opening the halves, and departing one half from the abutment plane, and includes two mechanisms for compacting the abrasive powder. The structure for closing, sealing, and opening the two halves along the abutment plane includes a ring having two cams divided by a slot. The ring sits in annular recesses separated by a slot and arranged on a support of the shaft of the mechanism for compacting the abrasive powder.

Abstract: The method envisages measuring strip tension and computing the difference between tensions at the inlet to and outlet from each descaling zone, comparing this difference is strip tension with a preset difference, and compensating for deviations in strip tension from the preset difference by varying the pressure exerted by the powder on the strip in each descaling zone.